An invisible monster is a good idea for a movie if done right. Fiend Without a Face is a great example. This one is not-- a lot of talking and very little monster-time on screen. On the other hand, it does have Ingrid Pitt and a classic Range Rover in it. Two stars.

The monster isn't supposed to be a vampire dinosaur or invisible dinosaur. It is prehistoric, but completely alien to science. There is some suggestion that it is the spawn of a serpent from Greek mythology but the U.S. dubbing obscures this.
I think this is a cool little thriller. I especially like the part when the invisible creature has the hatchet stuck into it, floating around. I also think its funny how the inserted the unused blank title sequence in the cave back into the movie to pad the running time for U.S. TV. Its pretty weird and I'd bet that most TV stations probably cut it out anyway.

A stick of dynamite is used to create a hole in a thick cave wall, conveniently free of boulders and big enough for a man-sized creature to pass, which reveals some petrified eggs instead of hoped for treasure. After the explorers leave, something that quickly becomes invisible emerges from one such egg, cracked by the explosion. A few hours later it has grown large enough to kill a man, and drain the blood from his body. Not a bad start.

The second act was just boring. The screenwriter, director, and cast seem to have conspired to do nothing, well nothing competently, to maintain suspense and terror as the monster has them holed up indoors.

There were real excitement and frights in the third act, but goofy effects and that continuing conspiracy ruined it for me.

I downloaded the 692MB DivX file. It's an adequate VHS rip with a slight purplish cast to the video, easily removed. The dialog was clear, and seemed fairly natural for a dubbed, low budget horror movie.

I had to shoot myself 15 minutes into this one and as an invisible monster i have to say this is an insult to all invisible monsters everywhere.
The guys at the ehem.."party" couldn't even clap their hands to music in sinc. Can it be THAT hard to count 1, 2, 3 CLAP, 1, 2, 3 CLAP?
Also about 2 minutes in they blasted into the cave and low and behold a lamp was already lit up on the cave wall for them. How convenient is that for people exploring lost caves? I bet Magellan didn't have ready made harbors with loading docks in all the remote ports he sailed into, but what do I know?